Submission #1052898

#	Time	Username	Problem	Language	Result	Execution time	Memory
1052898		vjudge1	Jobs (BOI24_jobs)	C++17	25 / 100	2058 ms	79188 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define vll vector<ll>
#define all(x) begin(x),end(x)
#define pb push_back
const int N=3e5+10;
ll pro[N],deg[N],par[N],mx[N],mi[N],sm[N];
vll ma[N];
set<vll> vals;
void dfs(int x,int p=-1)
{

    mx[x]=pro[x];
    vals.insert({mi[x],sm[x],x});
    for(auto y:ma[x])
    {
        sm[y]=sm[x]+pro[y];
        mi[y]=min(mi[x],sm[y]);
        dfs(y,x);
        mx[x]+=mx[y];
    }
    if(mx[x]<0)
        mx[x]=0;
}
ll node=-1;
ll mxp=-1e18;
ll cursm=0;
void dfs1(int x,int p=-1,ll sm=0,ll mi=0)
{
    sm+=pro[x];
    mi=min(mi,sm);
    if((mi+cursm)>=0)
    {
        if(sm>mxp)
        {
            mxp=sm;
            node=x;
        }
    }
    for(auto y:ma[x])
    {
        dfs1(y,x,sm,mi);
    }
}
void solve()
{
    ll n,s;
    cin>>n>>s;
    pro[0]=0;
    for(int i=1;i<=n;i++)
    {
        cin>>pro[i]>>par[i];        
        deg[i]++;
        ma[par[i]].pb(i);
    }
    ll mp=1e18;
    dfs(0);
    par[0]=-1;
    if(s==mp)
    {
        cout<<mx[0]<<endl;
    }
    else{
        ll og=s;
        cursm=s;
        for(int i=0;i<n;i++)
        {
            node=-1;
            mxp=-1e18;
            dfs1(0);
            if(mxp>0)
            {
                cursm+=mxp;
                while ((node!=-1))
                {
                    pro[node]=0;
                    node=par[node];
                }
            }
            else{
                break;
            }

        }
        cout<<cursm-og<<endl;
    }
}

int main()
{
	cin.tie(0);cout.tie(0);
	ios::sync_with_stdio(0);
	int t=1;
	// cin>>t;
	while(t--)
		solve();
}

• Subtask 1: 11 / 11
• Subtask 2: 14 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 29
• Subtask 5: 0 / 31